CVE-2026-39835

MEDIUM 5.3

Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

1th

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

Vendor	golang.org/x/crypto
Product	golang.org/x/crypto/ssh
Published	May 22, 2026
Last Updated	May 22, 2026

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Affected Versions

golang.org/x/crypto / golang.org/x/crypto/ssh

0 < 0.52.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/79563 groups.google.com: https://groups.google.com/g/golang-announce/c/a082jnz-LvI go.dev: https://go.dev/cl/781660 pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-5015

Credits

NCC Group Cryptography Services, sponsored by Teleport